SENTRY(R) Fiproguard(R) for Cats 6 Month Supply SENTRY Fiproguard is a topical flea and tick treatment that protects your cat from fleas, ticks, and chewing lice. Fiproguard contains Fipronil, the same active ingredient used in Frontline. One dose is fast-acting and long-lasting. Its sustained-release formula protects cats for up to 30 days. This includes (6) one-month doses. Features: Easy to apply Provides premium protection against fleas, ticks, and chewing lice Kills deer ticks, brown dog ticks, American dog ticks, and lone star ticks Controls mites that may cause mange Can be used on breeding, pregnant and lactating queens Waterproof; won't wash off Can be used on Cats over 8 weeks of age Item Specifications: Size: For cats over 1.5lbs Ingredients: Fipronil........9.7 Inert Ingredients ** ...90.3% ** diehtelyne glycol monoethyl ether.